DOI: 10.1016/j.foreco.2017.06.047
Scopus记录号: 2-s2.0-85021985025
论文题名: Responses of understory plant physiological traits to a decade of nitrogen addition in a tropical reforested ecosystem
作者: Mao Q. ; Lu X. ; Wang C. ; Zhou K. ; Mo J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 401 起始页码: 65
结束页码: 74
语种: 英语
英文关键词: Canopy closure
; Light limitation
; Nitrogen deposition
; Physiological traits
; Tropical forest
; Understory plants
Scopus关键词: Ecology
; Forestry
; Nitrogen
; Physiological models
; Physiology
; Plant shutdowns
; Tropics
; Canopy closures
; Light limitations
; Nitrogen deposition
; Physiological trait
; Tropical forest
; Understory plants
; Ecosystems
; Alchornea trewioides
英文摘要: Reforested ecosystems are becoming a dominant forest cover type in the tropics where anthropogenic nitrogen (N) deposition has been increasing greatly. Although understory plants play an important role in ecosystem structure and functioning, it remains unclear how long-term N deposition affects eco-physiological traits of understory species. To address this question, we expanded a ten-year simulated N deposition experiment in a tropical reforested ecosystem, with variable N addition levels as Control (no addition, N0), 50 kg N ha−1 yr−1 (N50), and 100 kg N ha−1 yr−1 (N100). Leaf physiological traits associated with photosynthetic capacity, foliar elements and N storage of seven dominant understory species were measured. Results showed that both medium-light species and shade-tolerant species had little physiological responses to N addition. However, one high-light species (Alchornea trewioides) responded significantly to N addition, showing decreases foliar N and Pmax. We further found that Pmax of Alchornea trewioides was negatively correlated with the canopy closure which increased under long-term N addition. Our findings suggest that understory plant growth may be more limited by light rather than N availability, particularly under chronic high N deposition; and N deposition can suppress understory high-light species through accelerating canopy closure in some tropical reforested ecosystems. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64188
Appears in Collections: 影响、适应和脆弱性
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作者单位: Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China; University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Mao Q.,Lu X.,Wang C.,et al. Responses of understory plant physiological traits to a decade of nitrogen addition in a tropical reforested ecosystem[J]. Forest Ecology and Management,2017-01-01,401